Doc: Update documentation of Qt::HANDLE

Qt::HANDLE is always defined as 'void *' on Qt 5.0

Task-number: QTBUG-32469

Change-Id: I3f0f2b19e65d54c88604e1cb65b5791c456b3003
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
HTTP internals: do not access reply that was deleted already

... rather than crashing.

Task-number: QTBUG-32404
Change-Id: Ia2f938394fb451459564ef5966419f952b3e2d0e
Reviewed-by: Richard J. Moore <rich@kde.org>